| Sobrecastiellu | |
| Settlement Type: | Parish |
| Pushpin Map: | Spain |
| Coordinates: | 43.1541°N -5.3021°W |
| Subdivision Type: | Country |
| Subdivision Name: | Spain |
| Subdivision Type1: | Autonomous community |
| Subdivision Name1: | Asturias |
| Subdivision Type2: | Province |
| Subdivision Name2: | Asturias |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Caso |
Sobrecastiellu is one of ten parishes (administrative divisions) in Caso, a municipality within the province and autonomous community of Asturias, in northern Spain.
The parroquia is 89.05km2 in size, with a population of 469 (INE 2006). The postal code is 33996.
Sobrecastiellu, which in asturian means uppercastle, is composed by the following villages and hamlets:
The day of the Parroquia is celebrated the 6th of august in the village of Bezanes. It is a hard party where alcohol, drugs and emotions flow freely across the mountains. There have been no mortal casualties during the celebrations for the last 23 years (2017). Some of the most legendary bands that have performed there are Juan Luis and su acordeón or Fervinchu de Cáñamo.